| 摘要 |
[Problem] To provide an abnormality detection system and an abnormality detection method which are capable of detecting abnormality at an early stage, the abnormality occurring in a facility such as a chemical plant, an oil refinery plant, or a thermal power plant. [Solving Means] An abnormality detection system includes an optical fiber 26, a backscattered light detection unit 20, and a data processing unit 30. The backscattered light detection unit 20 is connected to one end and the other end of the optical fiber 26 and configured to acquire a first intensity distribution of backscattered light by causing light to enter the optical fiber 26 from the one end, and to acquire a second intensity distribution of backscattered light by causing light to enter the optical fiber 26 from the other end. The data processing unit 30 is configured to calculate the product of a value obtained by applying a first FIR filter to the first intensity distribution acquired by the backscattered light detection unit 30, and a value obtained by applying a second FIR filter to the second intensity distribution acquired by the backscattered light detection unit 30, for each of locations on the optical fiber 26 in the length direction thereof, and to determine whether or not abnormality is present based on the result of the calculation. |
